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New Well Pump Help

I live on Long Island NY. I am in a sandy/clay soil area. About 10 years ago I hand installed a 2" well point down to about 25 feet with galvanized pipe. Water table is abut 13 feet so I have plenty of water in the pipe. I was using a 1.5 HP centrifugual pump to provide water to my irrigation system. I noticed a drop in pressure this season. I had a new 1.5 HP WaterAce pump in the basement so I installed it. After I did, I wasn't gettin any water after multiple priming attempts.
I then replaced the check valve, opened the well pipe and tried to flush with a hose doen the pipe. I did get some sediment out. I reinstalled everything and reprimed. I am flowing water but no where near what I was with the old pump and what my needs are. I have looked for air leaks in the above ground piping and have not spotted any.
The well was outside my house when I drove it. It is now under a crawl space so my work space and options are limited. Short of driving a new well outside the house again is there anything I can do?
I am at wits end with this. It's 90 degrees and sunny .. and my grass is turning. What can I try?
Thanks ... John

Thanks!

I am trying that now. I am back washing under pressure. Turning hose on/off. Initially I felt resistance when the water got to top of pipe. Now I have a gentle flow into the well. I will see what happens..

Still Not Working

I have back washed the point 5 times, reprimed and still not much luck. I wonder if it could be the "new" pump? How do I tell it's working correctly? I am now also thinking about driving a new well. If I go with 1 1/2 inch point what size pump should I be using? If I go with a 2" point?

If you want to get technical, you get a vacuum gauge and see how it reads when you connect it to the suction side. I had a clogging problem on a well point, and doing the backwash process got my as-new performance back. I had to repeat it every other year.

As for pumps, Home Depot and Lowes are not on my radar, so I don't even remotely care about anything they sell. I install cast-iron jet pumps made by Goulds.